I think I'm supposed to feel something called "hungry" before I feel the pains of not having eaten, but I don't. Luckily at work both my fellow programmers DO feel hunger and remind me ("Wanna go for lunch?" me(looking at my watch): "Yeah, I guess I must be hungry now..." )
I actually have 4 regular alarms on my mobile: 06:32 "wake up" (and take the first Ritalin), 06:51 "stand up" (in case i ignored the first), 11:45 "Lunch" (and take the midday pill), 15:55 "Go home" (and take the last pill). But they're all too easy to just dismiss and forget. At work they think it's hilarious that I have an alarm to remember to eat..
A TIP: Bananas is nice if you're unsure if you are hungry or sick;
one banana will rise your blood sugar level within 10 minutes or so enough to stop the hunger pain somewhat if that is the problem (and it's easy to shove one down even if you feel really sick and not in the mood for any food at all);
and it has a not-too-bad consistency for vomiting, if it turns out you were wrong and actually were sick (cereals is a lot worse in reverse)
Strangely when I smoke sigarettes (back when I smoked regularily, and when I'm having a lapse), i DO get a sensation of hunger (as people who can feel it explains it) if i forget to smoke,
while if i forget to drink coffee or use "snus" (sweedish oral tobacco) it just gives my a headache (that's how you spell it, looks strange to me now...??).